<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>应用程序标签</title>
    <style>
        .content::after{
            content:'dcc';
            color:blue;
        }
    </style>
</head>

<body>
    <div class="content">dataa</div>
    <input type="text" list="input_list">
    <datalist id="input_list">
        <option value="jintao"></option>
        <option value="qianlai"></option>
    </datalist>
    
    <progress class="my_progress" value="10"max="100"></progress>
</body>
</html>